CN103484743A - Rare earth magnesium alloy and preparation method thereof - Google Patents
Rare earth magnesium alloy and preparation method thereof Download PDFInfo
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Abstract
The invention provides a rare earth magnesium alloy and a preparation method thereof. The rare earth magnesium alloy comprises the following components in percentage by weight: 3.5-4.5% of Gd, 2.2-2.8% of Y, 1.5-2.0% of Nd, 0.1-1.5% of Dy, 0.45-0.55% of Zr and the balance of Mg. The rare earth magnesium alloy provided by the invention is prepared through the following steps: melting magnesium, a magnesium-gadolinium intermediate alloy, a magnesium-yttrium intermediate alloy, a magnesium-neodymium intermediate alloy, a magnesium-dysprosium intermediate alloy and a magnesium-zirconium intermediate alloy to prepare a rare earth magnesium alloy cast; and performing heat treatment on the rare earth magnesium alloy cast obtained in the above step to obtain the rare earth magnesium alloy. The content of rare earth in percentage by weight in the rare earth magnesium alloy provided by the invention is not higher than 10%, and the good mechanical properties can be simultaneously realized at high temperature.
Description
Technical field
The present invention relates to the magnesium alloy technical field, relate in particular to a kind of magnesium-rare earth and preparation method thereof.
Background technology
Magnesium alloy is to take magnesium to add other elementary composition alloys as base.It is little that it has density, specific tenacity is high, larger than Young's modulus, good heat dissipation, the characteristics such as shock absorbing is good, and the loading capacity that withstands shocks is large, and the corrosive nature of anti-organism and alkali is good, magnesium alloy is in practical metal to be the lightest structural metallic materials, is widely used in the important military civil areas such as Aeronautics and Astronautics, transportation, chemical industry, rocket.Magnesium alloy is according to the alloying element of main interpolation, can be divided into a variety ofly, also has very big difference on performance.In recent years, along with industry to the research of rare earth element character and the applicating and exploitation of related products, rare earth element is come into one's own in the magnesium alloy research field day by day as important alloying element, and in magnesium alloy system newly developed now, the magnesium alloy system that contains rare earth reaches more than 50%.
Magnesium-rare earth refers to the magnesium alloy that contains rare earth element, because the atomic size radius of most of rare earth element and magnesium differs in ± 15% scope, larger solid solubility is arranged in magnesium, thereby there is good solution strengthening and the effect of precipitation strength, can effectively improve alloy structure and microtexture, strengthen alloy corrosion resistance and thermotolerance, improve the mechanical property of Alloy At Room Temperature and high temperature.Rare earth element atomic diffusion ability, have remarkable effect to improving the magnesium alloy recrystallization temperature and slowing down recrystallization process simultaneously.In addition, rare earth element also has good ageing strengthening effect, can separate out highly stable disperse phase particle, thereby increases substantially hot strength and the creep resistance of magnesium alloy.
Along with the development of global Space Science and Technology, day by day urgent to the demand of high performance light material, particularly the demand of the large-sized structural parts such as aeronautical instrument, space capsule body to the light material resistance to elevated temperatures in recent years, impel the magnesium-rare earth development of high-strength temperature-resistant rapidly.The alloys such as the WE system that the magnesium-rare earth Rare-Earth Content is higher, Mg-Gd-Y-Zr system, Mg-Y-Gd-Zn-Zr system, because having good mechanical behavior under high temperature, have therefore obtained paying close attention to widely in aerospace field.
But, in this type of magnesium-rare earth, only have the rare earth mass percentage content to be greater than 10% and just there is significant characteristic.When content of rare earth is too low, the magnesium-rare earth mechanical behavior under high temperature is not good, and characteristic is not obvious; When content of rare earth is too high, excessive, the high cost of density, ductility are too low.Thereby this class alloy rare earth mass percentage content is all over 10%, thereby cause that its price is high, plasticity is poor, difficult processing, range of application is subject to larger restriction, is difficult to carry out industrial scale production.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of magnesium-rare earth and preparation method thereof, and magnesium-rare earth middle-weight rare earths mass percentage content provided by the invention, not higher than 10%, also at high temperature has good mechanical property simultaneously.
The invention discloses a kind of magnesium-rare earth, it is characterized in that, form and comprise by mass percentage:
Gd：3.5～4.5%；
Y：2.2～2.8%；
Nd：1.5～2.0%；
Dy：0.1～1.5%；
Zr：0.45～0.55%；
Surplus is Mg.
Preferably, comprise 0.3～1.0% Dy.
The invention discloses a kind of preparation method of magnesium-rare earth, comprise the following steps:
A) magnesium, magnesium-gadolinium master alloy, magnesium-yttrium master alloy, Mg-Nd intermediate alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy melting is prepared to the magnesium-rare earth foundry goods;
B) by above-mentioned steps A) obtain magnesium-rare earth after the magnesium-rare earth heat treating castings that obtains.
Preferably, in described magnesium-gadolinium master alloy, the mass percent of magnesium is 70～90%, and the mass percent of gadolinium is 10～30%; In described magnesium-yttrium master alloy, the mass percent of magnesium is 70～90%, and the mass percent of yttrium is 10～30%; In described Mg-Nd intermediate alloy, the mass percent of magnesium is 70～90%, and the mass percent of neodymium is 10～30%; In described magnesium-dysprosium master alloy, the mass percent of magnesium is 70～90%, and the mass percent of dysprosium is 10～30%; In described magnesium-zirconium master alloy, the mass percent of magnesium is 60～80%, and the mass percent of zirconium is 20～40%.
Preferably, described steps A) be specially:
A1) under the effect of protection gas, by magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy melting, obtain the first melt;
A2) add magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy in above-mentioned the first melt, heat up and pass into argon gas, obtain the second melt;
A3) by steps A 2) after the second melt constant temperature of obtaining is standing, then cooling cast, and obtains the magnesium-rare earth foundry goods.
Preferably, the temperature of described melting is 750～770 ℃.
Preferably, the temperature of described intensification is 775～790 ℃, and the described time that passes into argon gas is 15～35 minutes.
Preferably, the described standing time is 10～30 minutes, and the temperature of described cooling is 730～750 ℃.
Preferably, concrete steps described step B) are:
B1) by described magnesium-rare earth foundry goods constant temperature 1～3 hour at the first temperature, then rise at the second temperature constant temperature 7～9 hours, finally at room temperature cooling 22～26 hours;
B2) by step B1) the magnesium-rare earth foundry goods processed constant temperature after 46～50 hours at the 3rd temperature, obtain magnesium-rare earth after at room temperature cooling.
Preferably, described the first temperature is 280～320 ℃, and described the second temperature is 510～550 ℃, and described the 3rd temperature is 180～220 ℃.
The invention discloses a kind of magnesium-rare earth and preparation method thereof, it is characterized in that, form and comprise by mass percentage: Gd:3.5～4.5%, Y:2.2～2.8%, Nd:1.5～2.0%, Dy:0.1～1.5%, Zr:0.45～0.55%, all the other are Mg.Compared with prior art, the present invention adopts multi-element alloyed method to reduce the proportion of rare earth element in alloy, take full advantage of the complementary relationship of rare earth element aspect strengthening mechanism, refining effect and distinctive rare earth element blend proportion by the Dy element, in the situation that magnesium-rare earth rare earth elements quality total content, not higher than 10%, makes magnesium-rare earth have better mechanical property under room temperature and high temperature.Experimental result shows, magnesium-rare earth provided by the invention at room temperature tensile strength is about 340MPa, and under the condition of 250 ℃, tensile strength is about 300MPa, and, under 200 ℃/80MPa condition, the creep strain of 100 hours is 0.16%.
The accompanying drawing explanation
The metallurgical microstructrue figure that Fig. 1 is the Mg-4Gd-3Y-2Nd-0.5Zr magnesium-rare earth of preparation in comparative example 1 of the present invention;
The metallurgical microstructrue figure that Fig. 2 is the Mg-4Gd-3Y-2Nd-0.1Dy-0.5Zr magnesium-rare earth of preparation in the embodiment of the present invention 1;
The metallurgical microstructrue figure that Fig. 3 is the Mg-4Gd-3Y-2Nd-0.5Dy-0.5Zr magnesium-rare earth of preparation in the embodiment of the present invention 2.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment, the preferred embodiments of the invention are described, but should be appreciated that these are described is the restriction for further illustrating the features and advantages of the present invention rather than patent of the present invention being required.
The invention discloses a kind of magnesium-rare earth, it is characterized in that, form and comprise by mass percentage:
Gd：3.5～4.5%；
Y：2.2～2.8%；
Nd：1.5～2.0%；
Dy：0.1～1.5%；
Zr：0.45～0.55%；
Surplus is Mg.
Magnesium-rare earth provided by the invention is in the situation that rare earth element quality total content, not higher than 10%, under room temperature and high temperature, has better mechanical property.
The present invention is raw materials used, and its source is not particularly limited, and that on market, buys gets final product.
The present invention is not particularly limited the definition of room temperature, with room temperature definition well known to those skilled in the art, gets final product, and is preferably 20～30 ℃.
In the present invention, form by mass percentage, the mass percentage content of described Dy is preferably 0.1～1.5%, and more preferably 0.2～1.3%, most preferably be 0.3～1.0%; The present invention is not particularly limited the source of Dy, with rare earth element well known to those skilled in the art source or commercially available rare earth element, gets final product; The present invention is not particularly limited the purity of Dy, with the purity of the rare earth element for the preparation of magnesium-rare earth well known to those skilled in the art, gets final product.
The present invention joins in magnesium-rare earth Dy as rare earth element, refining effect by the Dy element, can form the high temperature resistant metallographic structure that tiny and disperse distributes in magnesium-rare earth, therefore can in the situation that rare earth element mass percent total content not higher than 10%, can, under room temperature and hot conditions, there is better mechanical property.
In the present invention, form by mass percentage, the mass percentage content of described Gd is preferably 3.5～4.5%, and more preferably 3.7～4.3%; The mass percentage content of described Y is preferably 2.2～2.8%, and more preferably 2.3～2.7%; The present invention is not particularly limited the source of Gd and Y, with rare earth element well known to those skilled in the art source or commercially available rare earth element, gets final product; The present invention is not particularly limited the purity of Gd and Y, with the purity of the rare earth element for the preparation of magnesium-rare earth well known to those skilled in the art, gets final product.
The present invention joins Gd and Y in magnesium-rare earth as rare earth element, can carry significantly heavy alloyed high-temperature mechanical property.While Gd and Y belong to heavy rare earth element and have higher solid solubility in magnesium, and descend along with the reduction of temperature, by solution strengthening, can effectively improve the intensity of matrix in alloy, and form excellent aging precipitation reinforced alloys system.
In the present invention, form by mass percentage, the mass percentage content of described Nd is preferably 1.5～2.0%, and more preferably 1.6～1.9%; The present invention is not particularly limited the source of Nd, with rare earth element well known to those skilled in the art source or commercially available rare earth element, gets final product; The present invention is not particularly limited the purity of Nd, with the purity of the rare earth element for the preparation of magnesium-rare earth well known to those skilled in the art, gets final product.
The present invention joins in magnesium-rare earth Nd as rare earth element, can put forward heavy alloyed high-temperature capability, can also effectively purify the fused solution of magnesium-rare earth, thereby improve the castability of magnesium-rare earth simultaneously.
In the present invention, form by mass percentage, the mass percentage content of described Zr is preferably 0.45～0.55%, and more preferably 0.47～0.53%.The present invention is not particularly limited the source of Zr, with method preparation well known to those skilled in the art or commercially available getting final product; The present invention is not particularly limited the purity of Zr, with the purity for the preparation of magnesium-rare earth well known to those skilled in the art, gets final product.The present invention joins Zr in magnesium-rare earth, crystal grain thinning significantly, thus increase substantially alloy mechanical property.
In the present invention, in described magnesium-rare earth, form by mass percentage, all the other are Mg; The present invention is not particularly limited the source of Mg, with method preparation well known to those skilled in the art or commercially available getting final product; The present invention does not have other special restrictions to the purity of Mg, with the purity for the preparation of magnesium-rare earth well known to those skilled in the art, gets final product.
In the present invention, inevitably also comprise impurity element in described magnesium-rare earth.For example: Fe, Cu, Si and Ni.The present invention is not particularly limited the content of impurity element in magnesium-rare earth, content with the impurity element in magnesium-rare earth well known to those skilled in the art gets final product, the mass percentage content of described Fe is preferably Fe≤0.005%, more preferably Fe≤0.004%; The mass percentage content of described Cu is preferably Cu≤0.0005%, more preferably Cu≤0.0004%; The mass percentage content of described Si is preferably Si≤0.005%, more preferably Si≤0.004%; The mass percentage content of described Ni is preferably Ni≤0.0005%, more preferably Si≤0.0004%.
The present invention is directed in high rare earth component Mg-Gd-Y-Zr series alloy exists content of rare earth high, the problem that ductility is low, adopt multi-element alloyed method to reduce the proportion of rare earth element in alloy, take full advantage of the complementary relationship of rare earth element aspect strengthening mechanism, again by refining effect and the distinctive rare earth element blend proportion of Dy element, the quality total content makes rare earth element in the situation that, not higher than 10%, can have better mechanical property under room temperature and high temperature.
The invention discloses the preparation method of above-mentioned magnesium-rare earth, comprise the following steps:
A) magnesium, magnesium-gadolinium master alloy, magnesium-yttrium master alloy, Mg-Nd intermediate alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy melting is prepared to the magnesium-rare earth foundry goods;
B) by above-mentioned steps A) obtain magnesium-rare earth after the magnesium-rare earth heat treating castings that obtains.
The present invention prepares magnesium-gadolinium master alloy by magnesium and rare earth gadolinium, and in described magnesium-gadolinium master alloy, the mass percent of magnesium is preferably 70～90%, and more preferably 75～85%, the mass percent of described gadolinium is preferably 10～30%, and more preferably 15～25%.
The present invention prepares magnesium-yttrium master alloy by magnesium and rare-earth yttrium, and in described magnesium-yttrium master alloy, the mass percent of magnesium is preferably 70～90%, and more preferably 75～85%, the mass percent of described yttrium is preferably 10～30%, and more preferably 15～25%.
The present invention prepares Mg-Nd intermediate alloy by magnesium and rare earth neodymium, and in described Mg-Nd intermediate alloy, the mass percent of magnesium is preferably 70～90%, and more preferably 75～85%, the mass percent of described neodymium is preferably 10～30%, and more preferably 15～25%.
The present invention prepares magnesium-dysprosium master alloy by magnesium and rare earth dysprosium, and in described magnesium-dysprosium master alloy, the mass percent of magnesium is preferably 70～90%, and more preferably 75～85%, the mass percent of described dysprosium is preferably 10～30%, and more preferably 15～25%.
The present invention prepares magnesium-zirconium master alloy by magnesium and zirconium, and in described magnesium-zirconium master alloy, the mass percent of magnesium is preferably 60～80%, and more preferably 65～75%, the mass percent of described zirconium is preferably 20～40%, and more preferably 25～35%.
The preparation of above-mentioned magnesium-gadolinium master alloy, magnesium-yttrium master alloy, Mg-Nd intermediate alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy in the present invention, do not have dividing of precedence.The present invention is not particularly limited other character of above-mentioned master alloy, with the character of the master alloy for the preparation of magnesium-rare earth well known to those skilled in the art, gets final product.
The present invention does not have other special restrictions to the process of melting; take MAGNESIUM METAL and rare-earth element gadolinium as example, and detailed process can be: under the effect of protection gas, at first by melting after MAGNESIUM METAL and rare-earth element gadolinium heating; again fused solution is stirred also standing, finally obtain magnesium-gadolinium master alloy.Described protection gas is preferably SF
6with CO
2mixed gas, described SF
6: CO
2volume ratio be preferably 1:200; The temperature of described melting is preferably 770～800 ℃, more preferably 780～790 ℃.The described standing time is preferably 10～30 minutes, more preferably 15～25 minutes.The present invention is not particularly limited the equipment of melting, is preferably cast iron or plumbago crucible.
All preferably according to the preparation process of magnesium-gadolinium master alloy, prepared by magnesium in the present invention-yttrium master alloy, Mg-Nd intermediate alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy.
The present invention is not particularly limited the source of above-mentioned master alloy, can prepare as stated above, and those skilled in the art also can obtain by other approach.
The present invention is after obtaining above-mentioned magnesium-gadolinium master alloy, magnesium-yttrium master alloy, Mg-Nd intermediate alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy; under the effect of protection gas; at first by magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy melting, obtain the first melt.Described protection gas is preferably SF
6with CO
2mixed gas, described SF
6: CO
2volume ratio be preferably 1:200; The temperature of described melting is preferably 750～770 ℃, more preferably 755～765 ℃.
The equipment of melting of the present invention is not particularly limited, and is preferably cast-iron pot; The present invention is not particularly limited the addition sequence of magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy, is preferably and adds successively magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy; The present invention to magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy pile up the order be not particularly limited, be preferably magnesium-gadolinium master alloy and Mg-Nd intermediate alloy piled up on magnesium, thus after melting, can mix more even.
And then add magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy in above-mentioned the first melt, and heat up and pass into argon gas, obtain the second melt; The temperature of described intensification is preferably 775～790 ℃, more preferably 780～785 ℃; The described time that passes into argon gas is preferably 15～35 minutes, more preferably 20～30 minutes; The present invention is not particularly limited described argon gas, with the argon gas as protection gas well known to those skilled in the art, gets final product; The present invention is not particularly limited the described equipment that passes into argon gas, passes into equipment with argon gas well known to those skilled in the art and gets final product.
After finally above-mentioned the second melt constant temperature is standing, then cooling cast, and obtains the magnesium-rare earth foundry goods; The described standing time is preferably 20～40 minutes, more preferably 25～35 minutes; The temperature of described cooling is preferably 730～750 ℃, more preferably 735～745 ℃.The present invention is not particularly limited the detailed process of casting, with the process of casting magnesium-rare earth well known to those skilled in the art, gets final product.
The present invention, after obtaining the magnesium-rare earth foundry goods, after it is heat-treated, obtains magnesium-rare earth, further to strengthen the mechanical property of magnesium-rare earth.The present invention is not particularly limited described heat treated equipment, preferably adopts the resistance heat treatment furnace; Heat treated concrete steps of the present invention are:
At first by magnesium-rare earth foundry goods constant temperature at the first temperature, then rise to constant temperature at the second temperature, finally at room temperature cooling; Described the first temperature is preferably 280～320 ℃, more preferably 290～310 ℃; At described the first temperature, the time of constant temperature is preferably 1～3 hour, more preferably 1.5～2.5 hours; Described the second temperature is preferably 510～550 ℃, more preferably 520～540 ℃; At described the second temperature, the time of constant temperature is preferably 7～9 hours, more preferably 7.5～8.5 hours; Be preferably 22～26 hours the cooling time under described room temperature, more preferably 23～25 hours; Room temperature of the present invention, do not have special requirement to its definition, is room temperature concept well known to those skilled in the art, is preferably 15～25 ℃, more preferably 17～22 ℃.
Then the magnesium-rare earth foundry goods of above-mentioned steps being processed at the 3rd temperature after constant temperature, the cooling magnesium-rare earth that obtains at room temperature; Described the 3rd temperature is preferably 180～220 ℃, more preferably 190～210 ℃; At described the second temperature, the time of constant temperature is preferably 46～50 hours, more preferably 47～49 hours; Room temperature of the present invention, do not have special requirement to its definition, is room temperature concept well known to those skilled in the art, is preferably 15～25 ℃, more preferably 17～22 ℃.
The present invention carries out Mechanics Performance Testing to above-mentioned magnesium-rare earth, result shows, at room temperature its tensile strength is 330～350MPa, yield strength is 190～220MPa, unit elongation is 6～9%, compare the rare earth mass content and be not less than the mechanical performance index (tensile strength 330MPa, yield strength 180MPa, unit elongation 3%) of 15% Mg-Gd-Y-Zr magnesium alloy, raising is in various degree all arranged.Under 250 ℃ of high temperature, its tensile strength is 260～310MPa, yield strength is 170～180MPa, unit elongation is 14～18%, compare the rare earth mass content and be not less than the mechanical performance index (tensile strength 255MPa, yield strength 170MPa, unit elongation 5%) of 15% Mg-Gd-Y-Zr magnesium alloy, raising is in various degree arranged equally.
Magnesium-rare earth provided by the invention and preparation method thereof, the strengthening that has realized a small amount of multicomponent alloy by refining effect and the distinctive rare earth element blend proportion of Dy element, the rare earth element mass content not higher than 10% condition under, effectively raising the room temperature of magnesium-rare earth and the mechanical property under high temperature, is a kind of high-toughness heat-resistant magnesium-rare earth.Because it has good plasticity, the properties for follow of magnesium-rare earth provided by the invention also can improve accordingly simultaneously, and then the practicality enhancing, has increased its range of application in hi-tech industries such as aerospace.Experimental result shows, magnesium-rare earth provided by the invention at room temperature tensile strength is about 340MPa, and under the condition of 250 ℃, tensile strength is about 300MPa, and, under 200 ℃/80MPa condition, the creep strain of 100 hours is 0.16%.
In order to further illustrate the present invention, below in conjunction with embodiment, magnesium-rare earth provided by the invention is described in detail.
Comparative example 1
The Mg-4Gd-3Y-2Nd-0.5Zr magnesium-rare earth
1, prepare magnesium-rare earth intermediate alloy and magnesium-zirconium master alloy.
Prepare magnesium-gadolinium master alloy, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 80%, the mass percent of rare earth gadolinium is 20%, then MAGNESIUM METAL and rare earth gadolinium are put into to cast-iron pot, pass into the SF that volume ratio is 1:200
6: CO
2gas is as protection gas, and heat fused also is warming up to 780 ℃, stirs latter standing 20 minutes, then is cast into magnesium-gadolinium master alloy.
According to same processing parameter and proportioning raw materials, prepare respectively magnesium-yttrium master alloy and Mg-Nd intermediate alloy.
Prepare magnesium-zirconium intermediate alloy ingot, by MAGNESIUM METAL by the mass percent of raw material total mass is 70%, the mass percent of metal zirconium is 30% proportion relation and adopt above-mentioned processing parameter to prepare magnesium-zirconium master alloy.
2, preparation Mg-4Gd-3Y-2Nd-0.5Zr magnesium-rare earth foundry goods.
According to the loss situation of each metallic element in fusion process, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 44%, the mass percent of magnesium-gadolinium master alloy is 22%, the mass percent of magnesium-yttrium master alloy is 18%, the mass percent of Mg-Nd intermediate alloy is 11%, the mass percent of magnesium-zirconium master alloy is 5%.
At first above-mentioned raw materials is preheating to 200 ℃, the cast-iron pot to 300 ℃ of preheating simultaneously, pass into the SF that volume ratio is 1:200
6: CO
2gas, as protection gas, then adds magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy (master alloy is piled up the top in MAGNESIUM METAL) successively in cast-iron pot, and heating is melted fully and while being warming up to 760 ℃, obtained the first melt.
Add magnesium-yttrium master alloy and magnesium-zirconium master alloy again in cast-iron pot, continue to be heated to 780 ℃, until magnesium-yttrium master alloy and magnesium-zirconium master alloy, pass into argon gas stirring 20 minutes after melting fully, obtain the second melt.
Then by the homo(io)thermism of above-mentioned the second melt 780 ℃ standing 30 minutes, when melt temperature drops to 740 ℃, cast, obtain the magnesium-rare earth foundry goods.Above-mentioned magnesium-rare earth foundry goods is detected, and result is referring to table 1:
The chemical constitution of the magnesium-rare earth that table 1 comparative example 1 is prepared (mass percent)
| Gd | Y | Nd | Zr | Fe | Cu | Si | Ni | Mg |
| 3.98 | 2.51 | 1.96 | 0.47 | 0.002 | 0.0005 | 0.001 | 0.0003 | Surplus |
Mass percent from table 1 forms and can find out, the described method of comparative example 1 has prepared Mg-4Gd-3Y-2Nd-0.5Zr magnesium-rare earth foundry goods.
3, preparation Mg-4Gd-3Y-2Nd-0.5Zr magnesium-rare earth.
Above-mentioned magnesium-rare earth foundry goods is heat-treated, the magnesium-rare earth foundry goods is put into to the resistance heat treatment furnace, foundry goods is warming up to 300 ℃ of insulations 2 hours, be warming up to again 530 ℃ of insulations after 8 hours, blow-on is taken out the magnesium-rare earth foundry goods also at room temperature cooling 24 hours, then is warming up to 200 ℃ of insulations 48 hours.After insulation finishes, take out foundry goods at room temperature cooling, finally obtain the Mg-4Gd-3Y-2Nd-0.5Zr magnesium-rare earth.
The magnesium-rare earth that above-mentioned steps is obtained is observed, result is referring to Fig. 1, the metallurgical microstructrue figure that Fig. 1 is the Mg-4Gd-3Y-2Nd-0.5Zr magnesium-rare earth of preparation in comparative example 1 of the present invention, the magnesium-rare earth grain structure that comparative example 1 prepares as can be seen from Figure 1 is significantly thick.
The magnesium-rare earth that above-mentioned steps is obtained carries out Performance Detection, and its mechanical property is referring to table 6, table 7 and table 8.
Comparative example 2
The Mg-15Gd-5Y-0.5Zr magnesium-rare earth
1, prepare magnesium-zirconium master alloy.
Prepare magnesium-zirconium master alloy, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 70%, the mass percent of metal zirconium is 30%, then MAGNESIUM METAL and metal zirconium are put into to cast-iron pot, pass into the SF that volume ratio is 1:200
6: CO
2gas is as protection gas, and heat fused also is warming up to 780 ℃, stirs latter standing 20 minutes, then is cast into magnesium-zirconium master alloy.
2, preparation Mg-15Gd-5Y-0.5Zr magnesium-rare earth foundry goods.
According to the loss situation of each metallic element in fusion process, by MAGNESIUM METAL by the mass percent of raw material total mass be 70%, the rare earth gadolinium by the mass percent of raw material total mass be 17%, rare-earth yttrium prepared burden by the proportion relation that the mass percent of raw material total mass is 8%, magnesium-zirconium master alloy is 5% by the mass percent of raw material total mass.
At first above-mentioned raw materials is preheating to 200 ℃, the cast-iron pot to 300 ℃ of preheating simultaneously, pass into the SF that volume ratio is 1:200
6: CO
2gas, as protection gas, then adds magnesium, rare earth gadolinium, rare-earth yttrium and magnesium-zirconium master alloy in cast-iron pot, while being heated to 780 ℃, passing into until completely melted argon gas and stirs 20 minutes, obtains the first melt.
Then by the homo(io)thermism of above-mentioned the first melt 780 ℃ standing 30 minutes, when melt temperature drops to 740 ℃, cast, obtain the magnesium-rare earth foundry goods.Above-mentioned magnesium-rare earth foundry goods is detected, and result is referring to table 2:
The chemical constitution of the magnesium-rare earth that table 2 comparative example 2 is prepared (mass percent)
| Gd | Y | Nd | Zr | Fe | Cu | Si | Ni | Mg |
| 16.15 | 5.11 | 0 | 0.43 | 0.002 | 0.0005 | 0.001 | 0.0003 | Surplus |
Mass percent from table 2 forms and can find out, the described method of comparative example 2 has prepared Mg-15Gd-5Y-0.5Zr magnesium-rare earth foundry goods.
2, preparation Mg-15Gd-5Y-0.5Zr magnesium-rare earth.
Above-mentioned magnesium-rare earth foundry goods is heat-treated, the magnesium-rare earth foundry goods is put into to the resistance heat treatment furnace, foundry goods is warming up to 300 ℃ of insulations 2 hours, be warming up to again 530 ℃ of insulations after 8 hours, blow-on is taken out the magnesium-rare earth foundry goods also at room temperature cooling 24 hours, then is warming up to 200 ℃ of insulations 48 hours.After insulation finishes, take out foundry goods at room temperature cooling, finally obtain the Mg-15Gd-5Y-0.5Zr magnesium-rare earth.
The magnesium-rare earth that above-mentioned steps is obtained carries out Performance Detection, and its mechanical property is referring to table 7, table 8 and table 9.
Embodiment 1
Mg-4Gd-3Y-2Nd-0.1Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth
1, prepare magnesium-rare earth intermediate alloy and magnesium-zirconium master alloy.
Prepare magnesium-gadolinium master alloy, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 70%, the mass percent of rare earth gadolinium is 30%, then MAGNESIUM METAL and rare earth gadolinium are put into to cast-iron pot, pass into the SF that volume ratio is 1:200
6: CO
2gas is as protection gas, and heat fused also is warming up to 770 ℃, stirs latter standing 10 minutes, then is cast into magnesium-gadolinium master alloy.
According to same processing parameter and proportioning raw materials, prepare respectively magnesium-yttrium master alloy, Mg-Nd intermediate alloy and magnesium-dysprosium master alloy.
Prepare magnesium-zirconium intermediate alloy ingot, by MAGNESIUM METAL by the mass percent of raw material total mass is 60%, the mass percent of metal zirconium is 40% proportion relation and adopt above-mentioned processing parameter to prepare magnesium-zirconium master alloy.
2, preparation Mg-4Gd-3Y-2Nd-0.1Dy-0.5Zr magnesium-rare earth foundry goods.
According to the loss situation of each metallic element in fusion process, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 43.4%, the mass percent of magnesium-gadolinium master alloy is 22%, the mass percent of magnesium-yttrium master alloy is 18%, the mass percent of Mg-Nd intermediate alloy is 11%, the mass percent of magnesium-dysprosium master alloy is 0.6%, the mass percent of magnesium-zirconium master alloy is 5%.
At first above-mentioned raw materials is preheating to 200 ℃, the cast-iron pot to 300 ℃ of preheating simultaneously, pass into the SF that volume ratio is 1:200
6: CO
2gas, as protection gas, then adds magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy (master alloy is piled up the top in MAGNESIUM METAL) successively in cast-iron pot, and heating is melted fully and while being warming up to 750 ℃, obtained the first melt.
Add magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy again in cast-iron pot, continue to be heated to 775 ℃, pass into argon gas after melting fully until magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy and stir 15 minutes, obtain the second melt.
Then by the homo(io)thermism of above-mentioned the second melt 775 ℃ standing 20 minutes, when melt temperature drops to 730 ℃, cast, obtain the magnesium-rare earth foundry goods that contains rare earth Dy.Above-mentioned magnesium-rare earth foundry goods is detected, and result is referring to table 3:
The chemical constitution of the magnesium-rare earth that table 3 embodiment 1 is prepared (mass percent)
| Gd | Y | Nd | Dy | Zr | Fe | Cu | Si | Ni | Mg |
| 3.98 | 2.51 | 1.96 | 0.11 | 0.47 | 0.002 | 0.0005 | 0.001 | 0.0003 | Surplus |
Mass percent from table 3 forms and can find out, the described method of embodiment 1 has prepared Mg-4Gd-3Y-2Nd-0.1Dy-0.5Zr magnesium-rare earth foundry goods.
3, preparation Mg-4Gd-3Y-2Nd-0.1Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth.
Above-mentioned magnesium-rare earth foundry goods is heat-treated, the magnesium-rare earth foundry goods is put into to the resistance heat treatment furnace, foundry goods is warming up to 280 ℃ of insulations 1 hour, be warming up to again 510 ℃ of insulations after 7 hours, blow-on is taken out the magnesium-rare earth foundry goods also at room temperature cooling 22 hours, then is warming up to 180 ℃ of insulations 46 hours.After insulation finishes, take out foundry goods at room temperature cooling, finally obtain Mg-4Gd-3Y-2Nd-0.1Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth.
The high-toughness heat-resistant magnesium-rare earth that above-mentioned steps is obtained is observed, result is referring to Fig. 2, the metallurgical microstructrue figure that Fig. 2 is the Mg-4Gd-3Y-2Nd-0.1Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth of preparation in the embodiment of the present invention 1, the remarkable refinement of high-toughness heat-resistant magnesium-rare earth crystal grain that the present embodiment prepares as can be seen from Figure 2, a large amount of disperses of the grain boundaries high temperature resistant metallographic structure that distributing.
The high-toughness heat-resistant magnesium-rare earth that above-mentioned steps is obtained carries out Performance Detection, and its mechanical property is referring to table 7, table 8 and table 9.
Embodiment 2
Mg-4Gd-3Y-2Nd-0.5Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth
1, prepare magnesium-rare earth intermediate alloy and magnesium-zirconium master alloy.
Prepare magnesium-gadolinium master alloy, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 80%, the mass percent of rare earth gadolinium is 20%, then MAGNESIUM METAL and rare earth gadolinium are put into to cast-iron pot, pass into the SF that volume ratio is 1:200
6: CO
2gas is as protection gas, and heat fused also is warming up to 780 ℃, stirs latter standing 20 minutes, then is cast into magnesium-gadolinium master alloy.
According to same processing parameter and proportioning raw materials, prepare respectively magnesium-yttrium master alloy, Mg-Nd intermediate alloy and magnesium-dysprosium master alloy.
Prepare magnesium-zirconium intermediate alloy ingot, by MAGNESIUM METAL by the mass percent of raw material total mass is 70%, the mass percent of metal zirconium is 30% proportion relation and adopt above-mentioned processing parameter to prepare magnesium-zirconium master alloy.
2, preparation Mg-4Gd-3Y-2Nd-0.5Dy-0.5Zr magnesium-rare earth foundry goods.
According to the loss situation of each metallic element in fusion process, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 40.5%, the mass percent of magnesium-gadolinium master alloy is 22%, the mass percent of magnesium-yttrium master alloy is 18%, the mass percent of Mg-Nd intermediate alloy is 11%, the mass percent of magnesium-dysprosium master alloy is 3.5%, the mass percent of magnesium-zirconium master alloy is 5%.
At first above-mentioned raw materials is preheating to 200 ℃, the cast-iron pot to 300 ℃ of preheating simultaneously, pass into the SF that volume ratio is 1:200
6: CO
2gas, as protection gas, then adds magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy (master alloy is piled up the top in MAGNESIUM METAL) successively in cast-iron pot, and heating is melted fully and while being warming up to 760 ℃, obtained the first melt.
Add magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy again in cast-iron pot, continue to be heated to 780 ℃, pass into argon gas after melting fully until magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy and stir 20 minutes, obtain the second melt.
Then by the homo(io)thermism of above-mentioned the second melt 780 ℃ standing 30 minutes, when melt temperature drops to 740 ℃, cast, obtain the magnesium-rare earth foundry goods that contains rare earth Dy.Above-mentioned magnesium-rare earth foundry goods is detected, and result is referring to table 4:
The chemical constitution of the magnesium-rare earth that table 4 embodiment 2 is prepared (mass percent)
| Gd | Y | Nd | Dy | Zr | Fe | Cu | Si | Ni | Mg |
| 4.05 | 2.66 | 1.84 | 0.57 | 0.45 | 0.002 | 0.0005 | 0.001 | 0.0003 | Surplus |
Mass percent from table 4 forms and can find out, the described method of embodiment 2 has prepared Mg-4Gd-3Y-2Nd-0.5Dy-0.5Zr magnesium-rare earth foundry goods.
3, preparation Mg-4Gd-3Y-2Nd-0.5Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth.
Above-mentioned magnesium-rare earth foundry goods is heat-treated, the magnesium-rare earth foundry goods is put into to the resistance heat treatment furnace, foundry goods is warming up to 290 ℃ of insulations 2 hours, be warming up to again 530 ℃ of insulations after 8 hours, blow-on is taken out the magnesium-rare earth foundry goods also at room temperature cooling 24 hours, then is warming up to 190 ℃ of insulations 48 hours.After insulation finishes, take out foundry goods at room temperature cooling, finally obtain Mg-4Gd-3Y-2Nd-0.5Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth.
The high-toughness heat-resistant magnesium-rare earth that above-mentioned steps is obtained is observed, result is referring to Fig. 3, the metallurgical microstructrue figure that Fig. 3 is the Mg-4Gd-3Y-2Nd-0.5Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth of preparation in the embodiment of the present invention 2, the remarkable refinement of high-toughness heat-resistant magnesium-rare earth crystal grain that the present embodiment prepares as can be seen from Figure 3, a large amount of disperses of the grain boundaries high temperature resistant metallographic structure that distributing.
The high-toughness heat-resistant magnesium-rare earth that above-mentioned steps is obtained carries out Performance Detection, and its mechanical property is referring to table 7, table 8 and table 9.
Embodiment 3
Mg-4Gd-3Y-2Nd-1.0Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth
1, prepare magnesium-rare earth intermediate alloy and magnesium-zirconium master alloy.
Prepare magnesium-gadolinium master alloy, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 90%, the mass percent of rare earth gadolinium is 10%, then MAGNESIUM METAL and rare earth gadolinium are put into to cast-iron pot, pass into the SF that volume ratio is 1:200
6: CO
2gas is as protection gas, and heat fused also is warming up to 790 ℃, stirs latter standing 30 minutes, then is cast into magnesium-gadolinium master alloy.
According to same processing parameter and proportioning raw materials, prepare respectively magnesium-yttrium master alloy, Mg-Nd intermediate alloy and magnesium-dysprosium master alloy.
Prepare magnesium-zirconium intermediate alloy ingot, by MAGNESIUM METAL by the mass percent of raw material total mass is 80%, the mass percent of metal zirconium is 20% proportion relation and adopt above-mentioned processing parameter to prepare magnesium-zirconium master alloy.
2, preparation Mg-4Gd-3Y-2Nd-1.0Dy-0.5Zr magnesium-rare earth foundry goods.
According to the loss situation of each metallic element in fusion process, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 37%, the mass percent of magnesium-gadolinium master alloy is 22%, the mass percent of magnesium-yttrium master alloy is 18%, the mass percent of Mg-Nd intermediate alloy is 11%, the mass percent of magnesium-dysprosium master alloy is 7%, the mass percent of magnesium-zirconium master alloy is 5%.
At first above-mentioned raw materials is preheating to 200 ℃, the cast-iron pot to 300 ℃ of preheating simultaneously, pass into the SF that volume ratio is 1:200
6: CO
2gas, as protection gas, then adds magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy (master alloy is piled up the top in MAGNESIUM METAL) successively in cast-iron pot, and heating is melted fully and while being warming up to 770 ℃, obtained the first melt.
Add magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy again in cast-iron pot, continue to be heated to 790 ℃, pass into argon gas after melting fully until magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy and stir 35 minutes, obtain the second melt.
Then by the homo(io)thermism of above-mentioned the second melt 790 ℃ standing 40 minutes, when melt temperature drops to 750 ℃, cast, obtain the magnesium-rare earth foundry goods that contains rare earth Dy.Above-mentioned magnesium-rare earth foundry goods is detected, and result is referring to table 5:
The chemical constitution of the magnesium-rare earth that table 5 embodiment 3 is prepared (mass percent)
| Gd | Y | Nd | Dy | Zr | Fe | Cu | Si | Ni | Mg |
| 4.09 | 2.21 | 1.95 | 0.95 | 0.45 | 0.002 | 0.0005 | 0.001 | 0.0003 | Surplus |
Mass percent from table 5 forms and can find out, the described method of embodiment 3 has prepared Mg-4Gd-3Y-2Nd-1.0Dy-0.5Zr magnesium-rare earth foundry goods.
3, preparation Mg-4Gd-3Y-2Nd-1.0Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth.
Above-mentioned magnesium-rare earth foundry goods is heat-treated, the magnesium-rare earth foundry goods is put into to the resistance heat treatment furnace, foundry goods is warming up to 320 ℃ of insulations 3 hours, be warming up to again 550 ℃ of insulations after 9 hours, blow-on is taken out the magnesium-rare earth foundry goods also at room temperature cooling 26 hours, then is warming up to 220 ℃ of insulations 50 hours.After insulation finishes, take out foundry goods at room temperature cooling, finally obtain Mg-4Gd-3Y-2Nd-1.0Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth.
The high-toughness heat-resistant magnesium-rare earth that above-mentioned steps is obtained carries out Performance Detection, and its mechanical property is referring to table 7, table 8 and table 9.
Embodiment 4
Mg-4Gd-3Y-2Nd-1.5Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth
1, prepare magnesium-rare earth intermediate alloy and magnesium-zirconium master alloy.
Prepare magnesium-gadolinium master alloy, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 85%, the mass percent of rare earth gadolinium is 15%, then MAGNESIUM METAL and rare earth gadolinium are put into to cast-iron pot, pass into the SF that volume ratio is 1:200
6: CO
2gas is as protection gas, and heat fused also is warming up to 800 ℃, stirs latter standing 25 minutes, then is cast into magnesium-gadolinium master alloy.
According to same processing parameter and proportioning raw materials, prepare respectively magnesium-yttrium master alloy, Mg-Nd intermediate alloy and magnesium-dysprosium master alloy.
Prepare magnesium-zirconium intermediate alloy ingot, by MAGNESIUM METAL by the mass percent of raw material total mass is 75%, the mass percent of metal zirconium is 15% proportion relation and adopt above-mentioned processing parameter to prepare magnesium-zirconium master alloy.
2, preparation Mg-4Gd-3Y-2Nd-1.5Dy-0.5Zr magnesium-rare earth foundry goods.
According to the loss situation of each metallic element in fusion process, MAGNESIUM METAL is prepared burden by the proportion relation that the mass percent of raw material total mass is 34%, the mass percent of magnesium-gadolinium master alloy is 22%, the mass percent of magnesium-yttrium master alloy is 18%, the mass percent of Mg-Nd intermediate alloy is 11%, the mass percent of magnesium-dysprosium master alloy is 10%, the mass percent of magnesium-zirconium master alloy is 5%.
At first above-mentioned raw materials is preheating to 200 ℃, the cast-iron pot to 300 ℃ of preheating simultaneously, pass into the SF that volume ratio is 1:200
6: CO
2gas, as protection gas, then adds magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy (master alloy is piled up the top in MAGNESIUM METAL) successively in cast-iron pot, and heating is melted fully and while being warming up to 765 ℃, obtained the first melt.
Add magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy again in cast-iron pot, continue to be heated to 785 ℃, pass into argon gas after melting fully until magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy and stir 30 minutes, obtain the second melt.
Then by the homo(io)thermism of above-mentioned the second melt 785 ℃ standing 35 minutes, when melt temperature drops to 745 ℃, cast, obtain the magnesium-rare earth foundry goods that contains rare earth Dy.Above-mentioned magnesium-rare earth foundry goods is detected, and result is referring to table 6:
The chemical constitution of the magnesium-rare earth that table 6 embodiment 4 is prepared (mass percent)
| Gd | Y | Nd | Dy | Zr | Fe | Cu | Si | Ni | Mg |
| 3.85 | 2.48 | 1.82 | 1.55 | 0.49 | 0.002 | 0.0005 | 0.001 | 0.0003 | Surplus |
Mass percent from table 6 forms and can find out, the described method of embodiment 4 has prepared Mg-4Gd-3Y-2Nd-1.5Dy-0.5Zr magnesium-rare earth foundry goods.
3, preparation Mg-4Gd-3Y-2Nd-1.5Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth.
Above-mentioned magnesium-rare earth foundry goods is heat-treated, the magnesium-rare earth foundry goods is put into to the resistance heat treatment furnace, foundry goods is warming up to 310 ℃ of insulations 2.5 hours, be warming up to again 540 ℃ of insulations after 8.5 hours, blow-on is taken out the magnesium-rare earth foundry goods also at room temperature cooling 25 hours, then is warming up to 210 ℃ of insulations 49 hours.After insulation finishes, take out foundry goods at room temperature cooling, finally obtain Mg-4Gd-3Y-2Nd-1.5Dy-0.5Zr high-toughness heat-resistant magnesium-rare earth.
The high-toughness heat-resistant magnesium-rare earth that above-mentioned steps is obtained carries out Performance Detection, and its mechanical property is referring to table 7, table 8 and table 9.
Embodiment 5
The Mg-Gd-Y-Nd-Dy-Zr high-toughness heat-resistant magnesium-rare earth of the Mg-Gd-Y-Nd-Zr magnesium-rare earth of preparation in comparative example 1 and comparative example 2 and embodiment 1～4 preparation is at room temperature carried out to the mechanical property contrast, and comparing result is as follows:
The magnesium-rare earth mechanical property table (room temperature) of the magnesium-rare earth of table 7 comparative example 1～2 preparation and embodiment 1～4 preparation
As can be seen from Table 6, in embodiment 1,2,3 and 4, the prepared high-toughness heat-resistant magnesium-rare earth that contains rare earth Dy is compared magnesium-rare earth in comparative example 1～2 and is at room temperature had better mechanical property and plasticity preferably.
The magnesium-rare earth mechanical property table (250 ℃) of the magnesium-rare earth of table 8 comparative example 1～2 preparation and embodiment 1～4 preparation
As can be seen from Table 7, in embodiment 1,2,3 and 4, the prepared high-toughness heat-resistant magnesium-rare earth that contains rare earth Dy is compared magnesium-rare earth in comparative example 1～2 and is at high temperature had better mechanical property and plasticity preferably, room-temperature mechanical property is corresponding thereto compared, and mechanical behavior under high temperature decays less, intensity is high.
The magnesium-rare earth high temperature creep property table (200 ℃/80MPa) of the magnesium-rare earth of table 9 comparative example 1～2 preparation and embodiment 1～4 preparation
As can be seen from Table 8, the magnesium-rare earth that in embodiment 1,2,3 and 4, the prepared high-toughness heat-resistant magnesium-rare earth that contains rare earth Dy is compared in comparative example 1～2 has better mechanical behavior under high temperature, can be under 200 ℃/80MPa condition steady operation.
Above a kind of magnesium-rare earth provided by the invention and preparation method thereof is described in detail; having applied specific case herein sets forth principle of the present invention and embodiment; the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention; can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a magnesium-rare earth, is characterized in that, forms and comprise by mass percentage:
Gd：3.5～4.5%；
Y：2.2～2.8%；
Nd：1.5～2.0%；
Dy：0.1～1.5%；
Zr：0.45～0.55%；
Surplus is Mg.
2. magnesium-rare earth according to claim 1, is characterized in that, comprises 0.3～1.0% Dy.
3. the preparation method of a magnesium-rare earth comprises the following steps:
A) magnesium, magnesium-gadolinium master alloy, magnesium-yttrium master alloy, Mg-Nd intermediate alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy melting is prepared to the magnesium-rare earth foundry goods;
B) by above-mentioned steps A) obtain magnesium-rare earth after the magnesium-rare earth heat treating castings that obtains.
4. preparation method according to claim 3, is characterized in that, in described magnesium-gadolinium master alloy, the mass percent of magnesium is 70～90%, and the mass percent of gadolinium is 10～30%; In described magnesium-yttrium master alloy, the mass percent of magnesium is 70～90%, and the mass percent of yttrium is 10～30%; In described Mg-Nd intermediate alloy, the mass percent of magnesium is 70～90%, and the mass percent of neodymium is 10～30%; In described magnesium-dysprosium master alloy, the mass percent of magnesium is 70～90%, and the mass percent of dysprosium is 10～30%; In described magnesium-zirconium master alloy, the mass percent of magnesium is 60～80%, and the mass percent of zirconium is 20～40%.
5. preparation method according to claim 3, is characterized in that, described steps A) be specially:
A1) under the effect of protection gas, by magnesium, magnesium-gadolinium master alloy and Mg-Nd intermediate alloy melting, obtain the first melt;
A2) add magnesium-yttrium master alloy, magnesium-dysprosium master alloy and magnesium-zirconium master alloy in above-mentioned the first melt, heat up and pass into argon gas, obtain the second melt;
A3) by steps A 2) after the second melt constant temperature of obtaining is standing, then cooling cast, and obtains the magnesium-rare earth foundry goods.
6. preparation method according to claim 5, is characterized in that, the temperature of described melting is 750～770 ℃.
7. preparation method according to claim 5, is characterized in that, the temperature of described intensification is 775～790 ℃, and the described time that passes into argon gas is 15～35 minutes.
8. preparation method according to claim 5, is characterized in that, the described standing time is 10～30 minutes, and the temperature of described cooling is 730～750 ℃.
9. preparation method according to claim 3, is characterized in that, described step B) concrete steps be:
B1) by described magnesium-rare earth foundry goods constant temperature 1～3 hour at the first temperature, then rise at the second temperature constant temperature 7～9 hours, finally at room temperature cooling 22～26 hours;
B2) by step B1) the magnesium-rare earth foundry goods processed constant temperature after 46～50 hours at the 3rd temperature, obtain magnesium-rare earth after at room temperature cooling.
10. preparation method according to claim 9, is characterized in that, described the first temperature is 280～320 ℃, and described the second temperature is 510～550 ℃, and described the 3rd temperature is 180～220 ℃.
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| CN104073702A (en) * | 2014-07-02 | 2014-10-01 | 中国科学院长春应用化学研究所 | Rear-earth magnesium alloy and preparation method thereof |
| CN105886809A (en) * | 2016-05-09 | 2016-08-24 | 贵州航天风华精密设备有限公司 | High-strength heat-resistant magnesium alloy smelting method and smelting structure |
| CN109666832A (en) * | 2019-02-22 | 2019-04-23 | 中国科学院长春应用化学研究所 | High-intensity thermal deformation resistant magnesium alloy and preparation method thereof |
| CN112410632A (en) * | 2020-11-20 | 2021-02-26 | 中国科学院长春应用化学研究所 | Mg-Gd-Y-Nd high-strength rare earth magnesium alloy and preparation method thereof |
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| CN101008060A (en) * | 2006-11-30 | 2007-08-01 | 中国科学院长春应用化学研究所 | Heat-proof magnesium-base rare earth alloy and its preparation method |
| CN101078080A (en) * | 2007-07-04 | 2007-11-28 | 北京有色金属研究总院 | Creep resistance magnesium alloy and preparation method thereof |
| EP2169090A1 (en) * | 2008-09-30 | 2010-03-31 | BIOTRONIK VI Patent AG | Implant made of a biodegradable magnesium alloy |
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| CN101008060A (en) * | 2006-11-30 | 2007-08-01 | 中国科学院长春应用化学研究所 | Heat-proof magnesium-base rare earth alloy and its preparation method |
| CN101078080A (en) * | 2007-07-04 | 2007-11-28 | 北京有色金属研究总院 | Creep resistance magnesium alloy and preparation method thereof |
| EP2169090A1 (en) * | 2008-09-30 | 2010-03-31 | BIOTRONIK VI Patent AG | Implant made of a biodegradable magnesium alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104073702A (en) * | 2014-07-02 | 2014-10-01 | 中国科学院长春应用化学研究所 | Rear-earth magnesium alloy and preparation method thereof |
| CN105886809A (en) * | 2016-05-09 | 2016-08-24 | 贵州航天风华精密设备有限公司 | High-strength heat-resistant magnesium alloy smelting method and smelting structure |
| CN109666832A (en) * | 2019-02-22 | 2019-04-23 | 中国科学院长春应用化学研究所 | High-intensity thermal deformation resistant magnesium alloy and preparation method thereof |
| CN112410632A (en) * | 2020-11-20 | 2021-02-26 | 中国科学院长春应用化学研究所 | Mg-Gd-Y-Nd high-strength rare earth magnesium alloy and preparation method thereof |
| CN112410632B (en) * | 2020-11-20 | 2022-03-08 | 中国科学院长春应用化学研究所 | Mg-Gd-Y-Nd high-strength rare earth magnesium alloy and preparation method thereof |
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